Citation: WANG Juan, LI Shi-Kun, ZHAO Zhen-Chao, ZHOU Dan-Hong, LU An-Hui, ZHANG Wei-Ping. Density Functional Theory Study of CO2 Adsorption in Amine-Functionalized Carbonaceous Materials[J]. Acta Physico-Chimica Sinica, ;2016, 32(7): 1666-1673. doi: 10.3866/PKU.WHXB201604012
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Density functional theory with dispersion correction (DFT-D3) was used to investigate the effects of N-doping on the adsorption of CO2 in carbonaceous materials. The CO2 adsorption energies and equilibrium geometry parameters were studied to compare the effects of various N-containing functional groups. The adsorption energies of single amide-and pyridine-type adsorbents were higher than those of aniline-and pyrroletype adsorbents, as a result of strong electrostatic interactions and/or the formation of weak hydrogen bonds. For pyrrole-type adsorbents, the adsorption energy increased with increasing number of benzene rings, because dispersion became the dominant interaction. These findings indicate that amide-and pyrrole-type adsorbents are the most promising CO2 trappers. The calculation results are consistent with our previous experimental conclusions for N-doped carbonaceous materials and will be useful for screening carbon materials to achieve more efficient CO2 capture.
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